溶剂型混凝土防腐涂料

分析了混凝土的腐蚀因素,介绍了溶剂型混凝土防腐涂料所具备的一般特性、涂料种类和主要性能,并简要说明了混凝土涂装和修补的一些原则及注意事项。     

混凝土防腐涂层典型失效行为分析

防腐涂层保护是提高混凝土耐久性最经济有效的措施之一。根据混凝土结构防腐涂装保护工程实例,将混凝土防腐涂层的典型失效行为进行了总结,并分析了失效原因,提出了防治办法。     

重防腐混凝土涂料的发展特点

介绍了重防腐混凝土涂料发展特点、配套类型、环保发展方向、涂装设备、涂装工艺流程和相应关键技术以及其五大应用领域的未来发展趋势.     

快干型氟碳涂料在混凝土结构湿表面涂装中的应用

介绍了混凝土结构湿表面的腐蚀环境和涂装环境特点，综述了快干型氟碳涂料的主要技术特点以及快干型氟碳涂料在混凝土湿表面涂装中的应用。     

杭州湾跨海大桥混凝土结构防腐方案介绍

简述了跨海大桥混凝土结构的防腐技术，着重介绍了杭州湾大桥混凝土结构表面防腐涂料体系的方案设计、涂料特性、涂装工艺及性能检测等。     

风电混凝土塔筒防护涂料与涂装

通过分析混凝土塔筒的腐蚀原理和环境特点、涂料产品技术要求,以及不同行业混凝土表面的防护标准和实践,推荐了适合于风电混凝土塔筒的防护涂料体系,以及现场涂装质量控制关键要求。     

核电站混凝土厂房用防护涂料涂装过程控制

随着国家核电工程建设步伐加快,核电站用防护涂料成为行业热点之一．介绍了核电站混凝土厂房防护涂料涂装的注意事项以及施工过程控制。     

涂装PVC塑料建筑构件的涂料

为了使ＰＶＣ（聚氯乙烯）塑料建筑构件经久耐用，以及改善和稳定塑料底材的外观，必须使用和充分发挥涂料的保护和装饰功能；为了提高ＰＶＣ塑料建筑构件的粘合性能和涂膜的涂装效果，必须对ＰＶＣ塑料建筑构件进行表面处理并进行并项有效的涂料涂装工作。本文重点叙述最近用于ＰＶＣ塑料建筑构件上的装饰涂料和功能性涂料。     

海工混凝土涂料的性能检测与对比研究

混凝土涂料防腐性能的优劣直接影响混凝土构筑物的使用寿命。在大气区和潮差区选用3种海工混凝土涂料以不同的配套体系分别进行涂装,按照日本土木协会和日本道路协会标准对3种涂料的裂缝追随性、附着强度、透水量和抗氯离子渗透性等性能分别检测,并对检测结果进行了分析和对比。     

可常规喷涂聚脲防腐蚀涂料在混凝土结构上的应用

论述了码头混凝土构件采用涂料进行防腐的必要性,介绍了一种特殊的可常规喷涂的聚脲涂料及其在金山二岛科普码头混凝土结构上应用的成功案例.     

环氧钢筋涂层的研制

分析了混凝土中钢筋的腐蚀环境及机理,介绍了一种针对性强的液体水工混凝土结构钢筋防腐涂料.以环氧树脂为基料,加入玻璃鳞片、颜料、助剂等,进行配方设计和性能分析.     

混凝土表层防护涂料研究进展

混凝土作为多孔结构的工程材料,在温度效应及外应力作用下,外界水分及有害物质可渗入到其毛细孔隙内部加速混凝土腐蚀,其耐久性受到影响。发展高性能混凝土防护涂料对于延长混凝土服役时间具有重要的作用。本文系统介绍了表面成膜型涂料、有机硅渗透型涂料、孔隙封闭型涂料对混凝土表层防护的研究现状、存在的问题以及发展方向。     

保护剂对清水混凝土抗碳化性能的影响

清水混凝土保护剂具有优异的防水性能,极大地提升了清水混凝土建筑的使用寿命。为精确确定清水混凝土保护剂对清水混凝土抗碳化性能的影响,本文研究了水溶性有机硅类渗透型保护剂和丙烯酸类成膜型保护剂对清水混凝土抗碳化性能的影响。结果表明:成膜型保护剂和渗透型保护剂均可有效降低清水混凝土碳化深度,成膜型保护剂降低效果更为显著;涂抹两种类型保护剂试件的碳化深度均随养护龄期的增加而降低,养护龄期和渗透型保护剂独立发挥作用,而养护龄期和成膜型保护剂相互促进,两者作用可进一步降低清水混凝土碳化深度;建立了清水混凝土碳化深度预测模型,该模型考虑了保护剂种类和厚度对清水混凝土抗碳化性能的影响。     

Modeling of time to corrosion-induced cover cracking in reinforced concrete structures

Service life of the concrete structures depends on the protective action provided by the cover concrete against the susceptibility of the reinforcement to the corrosive environment. Depending on the level of the oxidation of metallic iron, corrosion products may have much greater volume than the original iron that gets consumed by the process of corrosion. This volume expansion is mainly responsible for exerting the expansive radial pressure at the steel-concrete interface and development of hoop tensile stresses in the surrounding concrete resulting ultimately in the through cracking of the cover concrete. This cover cracking would indicate the loss of the service life for the corrosion-affected structures. In the present paper, an attempt has been made to develop analytical models for predicting the time to cover cracking by considering the residual strength of the cracked concrete and the stiffness provided by the combination of the reinforcement and expansive corrosion products. The problem is modeled as a boundary value problem wherein the governing equations are expressed in terms of the radial displacement and the analytical solutions are presented considering a simple 2-zone model for the cover concrete viz. cracked or uncracked. The analytical models are then evaluated through their ability to reproduce available experimental trends and subsequently a sensitivity analysis has also been carried out to show the influence of the various variable parameters of the proposed models with reference to the experimental trends.     

Synthesis of the mullite refractory ceramic coating under local heating

The possibility of performing the thermochemical synthesis in the M1 oxide ceramic coating under surface heating in order to produce mullite structures is considered with the aim of extending the field of application of protective oxide ceramic coatings and decreasing the power consumption. The coating is applied to a ShA chamotte brick. Then, the synthesis of mullite and mullite-like structures is provided with the use of surface heating by thermochemical compositions and the thermal insulation prepared from the refractory cellular concrete for the control of the heat removal.     

水性氟碳涂料对混凝土防护作用的研究

混凝土表面涂覆处理可以提高其结构的耐久性。以水性氟碳树脂涂料、硅丙乳液涂料为涂覆材料,通过测试混凝土的吸水率和抗氯离子渗透性能,研究不同的底漆、面漆对混凝土防护性能的影响,并研究了涂料黏度和厚度对涂层性能的影响,表征涂层在混凝土界面的结合情况。研究结果表明：水性硅丙乳液为底漆、水性氟碳树脂乳液为面漆的涂刷方式可以有效地提高混凝土的抗氯离子渗透性能,降低混凝土的吸水率;厚度对涂层防护性能的影响较大,黏度对涂料渗透性影响较大。     

强动载作用下海水海砂混凝土应用研究进展

岛礁建设工程对于维护我国合法权益有着重要意义,从大陆运送混凝土原材料到岛礁费时费力,且不经济,因此利用岛礁已有资源制成海水海砂混凝土成为岛礁建设工程中重要的建筑材料。本文系统介绍了海水海砂混凝土材料静动态力学性能、新型复合纤维材料(FRP)筋-海水海砂混凝土组合结构力学性能方面的研究现状,并指出应对海水海砂混凝土的动态力学性能作进一步的研究。进一步总结得到:海水海砂混凝土具有较高的早期强度且最终强度与普通混凝土相当,合理掺量纤维的加入可以明显改善海水海砂混凝土的力学性能,海水海砂混凝土拥有更为明显的应变率效应,FRP筋-海水海砂混凝土组合结构以其良好的耐腐蚀性可以更好地应用于广阔的海洋环境,是岛礁防护结构的重要选择。当前国际形势较为复杂,岛礁建设工程会遭受爆炸、侵彻等极端荷载的作用,因此,开展FRP筋-海水海砂混凝土组合结构抗冲击、抗爆性能研究是下一步的研究方向。     

混凝土防护涂层研究进展

混凝土防护涂层因具有良好的防护效果而被广泛应用于混凝土的防护领域。简要阐述了混凝土防护涂层研究的必要性,重点介绍了近年发展起来的玻璃鳞片防腐涂层、有机硅改性防腐涂层、氟碳防腐涂层、纳米复合防腐涂层、互穿聚合物网络防腐涂层和聚脲防腐涂层等新型混凝土防护涂层的组成、特点及取得的最新研究成果,提出该领域的发展方向是综合型和环保型防护涂层。     

Studies on the evaluation of the performance of organic coatings used for the prevention of corrosion of steel rebars in concrete structures

Corrosion of steel rebars in reinforced concrete constructions, particularly those located in marine environments and industrially polluted areas is one of the major problems baffling the construction industry all over the world including India. A suitable protective coating to rebar is found to improve the durability of such structures under aggressive exposures. The performance of a few polymeric coatings based on different resins such as acrylic polyol-aromatic isocyanate, polyester polyol-aromatic isocyanate, acrylic resin and epoxy–silicone–polyamide containing ordinary Portland cement or flyash as extenders and titanium dioxide and zinc phosphate as main pigments on rebar in concrete has been evaluated using mechanical strength tests and accelerated corrosion tests. It is observed that, of the 16 coating formulations, four have been found to perform well as effective and durable coatings.     

Increasing the life of linings of split steel discharge gutters in open hearth furnaces

Conclusions The protective coating made of air-setting concrete of chrome-magnesite composition protects the lining of forked and single steel-discharge gutters from the effects and penetration of molten metals and slags.The chemical inertness toward basic and fireclay refractories enables us to use the chrome-magnesite coating to protect concrete and brick linings of steel discharge gutters made of basic and fireclay refractories.The capacity of chrome-magnesite concrete based on magnesium-sulfate to become friable at 700–1100°C facilitates easy removal from the gutter of the slag and metal residues built up on the weakened zone of the protective layer.Easy restoration of the protective layer with chrome-magnesite mortar enabled us to introduce protective coatings at the North Steel plant without considerable expense and the use of equipment.Restoration of the concrete coating after each heat increased the life of the firebrick lining.The method proposed for increasing the life of the lining of forked and single gutters can be used in any steel plant.